Video Transcript
Which of the following is a
measurement of electric potential difference? (A) Five joules, (B) nine volts,
(C) eight newtons, (D) two amperes, (E) 10 watts.
We’re asked to identify which of
five options is a measurement of electric potential difference. All of the options start with a
value. Let’s recall that any measurement
starts with a value. A full description of a measurement
includes the quantity being measured, the value measured, and the unit associated
with that value. Here, the quantity measured is
electric potential difference, and we’ve seen that each possible answer has a
value.
To determine which of the options
shown can be a measurement of electric potential difference though, we must consider
the unit associated with the value. Specifically, we must find out
which option shows a measurement that uses the correct unit for electric potential
difference. The correct unit for electric
potential difference is the volt. Knowing this, we can identify
option (B), nine volts, as the correct answer, since it is the only option with the
unit of volts.
